| D.L. & P.R. Prest Limited | Northallerton | 1991 |
| D.L. Lemon (Wilton) Limited | Marlborough | 1961 |
| D.L. Ritchie (Laurels) Limited | North Walsham | 1964 |
| D.L.C.S. Limited | Somerton | 1993 |
| D.M. Keay & Sons Limited | Kirriemuir | 1960 |
| D.M. Woods Limited | Eastleigh | 2015 |
| D.M.Cargill(Farms)Limited | Halesworth | 1957 |
| D.N.C. Farms Ltd | Norwich | 2010 |
| D.N.D.Spibey Limited | Bakewell | 2014 |
| D.Obbard & Sons Limited | Kent | 1954 |
| D.P. Macgillivray (Calrossie) | Tain | 1959 |
| D.P.D. Limited | Glastonbury | 1999 |
| D.P.Nott & Sons Limited | Sudbury | 1958 |
| D.P.S. Farriery Limited | Droitwich | 2002 |
| D.R Farms Limited | Banbridge | 2023 |
| D.R. & J.F. Gamblin Limited | Fareham | 1987 |
| D.R. and a. Higgins & SON Limited | Nr. Shrewsbury | 1993 |
| D.R. Davies & Sons (Court Farm) Limited | Leominster | 1987 |
| D.R.F. (Farmers) Limited | Fraserburgh | 1979 |
| D.R.Perry & Co.(Bushley)Limited | Milton Keynes | 1963 |
| D.R.W. Reddaway Ltd | Taunton | 2003 |
| D.S. Bloodstock Ltd | Doncaster | 2023 |
| D.S. ORR & Sons Limited | Glasgow | 1965 |
| D.S. Robinson (Farms) Limited | Ripon | 1976 |
| D.S.Cheesman & Co | Nr Emsworth | 1959 |
| D.S.M. Fishing Limited | Buckie | 2004 |
| D.Stewart & SON, Limited | Christchurch | 1916 |
| D.T. Agri Ltd | Maidstone | 2021 |
| D.T. Engineering Limited | Matlock | 2001 |
| D.T.G. Elliott & SON Limited | Chatham | 1934 |
| D.W. Forestry Limited | Bishop Auckland | 2011 |
| D.W. Frost (Wholesale Nurseries) Limited | Notts | 1977 |
| D.W. Olive Limited | Honiton | 2000 |
| D.W. Pickford & SON Limited | Calne | 2003 |
| D.W. Rhodes (Farms) Limited | Norfolk | 1964 |
| D.W. Turville Limited | Lymington, | 1950 |
| D.W.F. Tulloch & Co. Limited | Oxfordshire | 1965 |
| D.W.Ferguson Limited | Dover | 1944 |
| D.W.Harrison Limited | Lincoln | 1965 |
| D.W.Hodges Limited | Somerset | 1960 |
| D.W.M. Contractors Limited | Kingsbridge | 2013 |
| D.W.P.Gough & Co Limited | Bury St. Edmunds | 1956 |
| D.Williams Forestry Limited | Dolgellau | 2010 |
| D.Y. Bishop & Co Limited | Kirriemuir | 1963 |
| D2 Plant & Agriculture Ltd | Market Drayton | 2020 |
| D3 Farming Limited | Honiton | 2017 |
| D3 Farms & Stables Limited | Horsham | 2018 |
| DA & MDM Awre Limited | Chippenham | 2024 |
| DA Boyd Groundworks Ltd | Fort William | 2015 |
| DA Cocoa and Trading Company Limited | London | 2022 |
| DA Vinci Grab and Go Food Ltd | Birmingham | 2024 |
| DA, CMJ & LA Tottle Limited | Yeovil | 2010 |
| Daarroch Limited | Glasgow | 2023 |
| DAB Groundworks Limited | Fort William | 2013 |
| Daban Bloodstock Limited | Newmarket | 2023 |
| Daborn’S Ltd | Sandhurst | 2020 |
| Daca Fishing Ltd | Caithness | 2019 |
| Dachshund Rescue at the Elms Limited | Brough | 2022 |
| Dachshunds & Doodles Limited | Sudbury | 2025 |
| Dacre Contract Management Limited | Dorchester | 1998 |
| Dacre Pigs Limited | Driffield | 1994 |
| Dadbrook Farm Limited | Aylesbury | 2020 |
| Daddyfish Farms Limited | Northampton | 2025 |
| Dadhich Group Limited | Swindon | 2022 |
| Dadmore Dairy Limited | Exeter | 2022 |
| Daecm Ltd | Linwood | 2024 |
| Daedalus Ventures Limited | Northampton | 2016 |
| Dagdogan Limited | Barking | 2018 |
| Dags Services Ltd | Huddersfield | 2016 |
| DAH Poultry Services Limited | Market Drayton | 2004 |
| Dahiet Elenaya Ltd | London | 2024 |
| Dahlia Beach Limited | Witney | 2021 |
| DAI Warlow Agricultural Contractors Limited | Dyfed | 2025 |
| Daily Contracting Ltd | Whitstable | 2026 |
| Daily Fresh Produce Ltd | Wolverhampton | 2018 |
| Daily Pick Ltd | Horsham | 2022 |
| Dairry Limited | London | 2020 |
| Dairy Active Ltd | Carmarthen | 2014 |
| Dairy Consulting Limited | London | 2022 |
| Dairy Decisions Ltd | Castle Cary | 2018 |
| Dairy Electrical Refrigeration Limited | Dorset | 2003 |
| Dairy Farm Managers Ltd | Haverfordwest | 2017 |
| Dairy Farming Ltd | Kilmarnock | 2018 |
| Dairy Futures | Nottingham | 2012 |
| Dairy House Livery Ltd | Altrincham | 2022 |
| Dairy Lane Ltd | Wrexham | 2022 |
| Dairy Lease Ltd | Cardiff | 2018 |
| Dairy Services & Spares Ltd | Omagh | 2025 |
| Dairy Supplies Limited | Newport | 2008 |
| Dairylands - Lakefront Lodges Limited | Lincoln | 2023 |
| Dairysmart UK Ltd | Newport | 2024 |
| Daisy Farm Ltd | Newark | 2021 |
| Daisy Farming Company Limited | Salisbury | 1995 |
| Daisy Hill Boarding Kennels Limited | Newry | 2021 |
| Daisy May's Farm Limited | Chelmsford | 2016 |
| Daisy Pixel Ltd | London | 2023 |
| Daisy's Dog Walking & Services Limited | Peacehaven | 2025 |
| Daisy's Future Ltd | Dunbar | 2023 |
| DAISY2017 Limited | Heathfield | 2017 |
| DAK Doggy Day Care & Grooming Ltd | Ingatestone | 2026 |